4 /* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
5 * See cxx source for full Copyright notice */
7 #include <AliKalmanTrack.h>
10 #include "AliBarrelTrack.h"
11 #include "AliTRDgeometry.h"
18 const unsigned kMAX_CLUSTERS_PER_TRACK=210;
20 class AliTRDtrack : public AliKalmanTrack {
22 // Represents reconstructed TRD track
26 AliTRDtrack():AliKalmanTrack(){}
27 AliTRDtrack(const AliTRDcluster *c, UInt_t index, const Double_t xx[5],
28 const Double_t cc[15], Double_t xr, Double_t alpha);
29 AliTRDtrack(const AliTRDtrack& t);
30 AliTRDtrack(const AliKalmanTrack& t, Double_t alpha);
31 AliTRDtrack(const AliESDtrack& t);
33 Int_t Compare(const TObject *o) const;
34 void CookdEdx(Double_t low=0.05, Double_t up=0.70);
36 Double_t GetAlpha() const {return fAlpha;}
37 Int_t GetSector() const {
38 //if (fabs(fAlpha) < AliTRDgeometry::GetAlpha()/2) return 0;
39 return Int_t(TVector2::Phi_0_2pi(fAlpha)/AliTRDgeometry::GetAlpha())%AliTRDgeometry::kNsect;}
41 Double_t GetC() const {return fC;}
42 Int_t GetClusterIndex(Int_t i) const {return fIndex[i];}
43 Float_t GetClusterdQdl(Int_t i) const {return fdQdl[i];}
45 void GetCovariance(Double_t cov[15]) const;
46 Double_t GetdEdx() const {return fdEdx;}
47 Double_t GetPIDsignal() const {return GetdEdx();}
48 Double_t GetEta() const {return fE;}
50 void GetExternalCovariance(Double_t cov[15]) const ;
51 void GetExternalParameters(Double_t& xr, Double_t x[5]) const ;
53 Double_t GetLikelihoodElectron() const { return fLhElectron; };
55 Double_t Get1Pt() const {return (1e-9*TMath::Abs(fC)/fC + fC)*GetConvConst(); }
56 Double_t GetP() const {
57 return TMath::Abs(GetPt())*sqrt(1.+GetTgl()*GetTgl());
59 Double_t GetPredictedChi2(const AliTRDcluster*, Double_t h01) const ;
60 Double_t GetPt() const {return 1./Get1Pt();}
61 void GetPxPyPz(Double_t &px, Double_t &py, Double_t &pz) const ;
62 void GetGlobalXYZ(Double_t &x, Double_t &y, Double_t &z) const ;
63 Int_t GetSeedLabel() const { return fSeedLab; }
64 Double_t GetSigmaC2() const {return fCcc;}
65 Double_t GetSigmaTgl2() const {return fCtt;}
66 Double_t GetSigmaY2() const {return fCyy;}
67 Double_t GetSigmaZ2() const {return fCzz;}
68 Double_t GetSnp() const {return fX*fC - fE;}
69 Double_t GetTgl() const {return fT;}
70 Double_t GetX() const {return fX;}
71 Double_t GetY() const {return fY;}
72 Double_t GetZ() const {return fZ;}
74 Double_t GetYat(Double_t xk) const {
75 //-----------------------------------------------------------------
76 // This function calculates the Y-coordinate of a track at the plane x=xk.
77 // Needed for matching with the TOF (I.Belikov)
78 //-----------------------------------------------------------------
79 Double_t c1=fC*fX - fE, r1=TMath::Sqrt(1.- c1*c1);
80 Double_t c2=fC*xk - fE, r2=TMath::Sqrt(1.- c2*c2);
81 return fY + (xk-fX)*(c1+c2)/(r1+r2);
84 Int_t PropagateTo(Double_t xr, Double_t x0=8.72, Double_t rho=5.86e-3);
85 void ResetCovariance();
86 void ResetClusters() { SetChi2(0.); SetNumberOfClusters(0); }
87 Int_t Rotate(Double_t angle);
89 void SetdEdx(Float_t dedx) {fdEdx=dedx;}
90 void SetLikelihoodElectron(Float_t l) { fLhElectron = l; };
92 void SetSampledEdx(Float_t q, Int_t i) {
93 Double_t s=GetSnp(), t=GetTgl();
94 q*= TMath::Sqrt((1-s*s)/(1+t*t));
98 void SetSeedLabel(Int_t lab) { fSeedLab=lab; }
100 Int_t Update(const AliTRDcluster* c, Double_t chi2, UInt_t i,
104 void GetBarrelTrack(AliBarrelTrack *track);
105 void AddNWrong() {fNWrong++;}
107 Int_t GetNWrong() const {return fNWrong;}
108 Int_t GetNRotate() const {return fNRotate;}
114 Int_t fSeedLab; // track label taken from seeding
115 Float_t fdEdx; // dE/dx
117 Double_t fAlpha; // rotation angle
118 Double_t fX; // running local X-coordinate of the track (time bin)
121 Double_t fY; // Y-coordinate of the track
122 Double_t fZ; // Z-coordinate of the track
124 Double_t fT; // tangent of the track momentum dip angle
125 Double_t fC; // track curvature
127 Double_t fCyy; // covariance
128 Double_t fCzy, fCzz; // matrix
129 Double_t fCey, fCez, fCee; // of the
130 Double_t fCty, fCtz, fCte, fCtt; // track
131 Double_t fCcy, fCcz, fCce, fCct, fCcc; // parameters
133 UInt_t fIndex[kMAX_CLUSTERS_PER_TRACK]; // global indexes of clusters
134 Float_t fdQdl[kMAX_CLUSTERS_PER_TRACK]; // cluster amplitudes corrected
137 Float_t fLhElectron; // Likelihood to be an electron
138 Int_t fNWrong; // number of wrong clusters
141 ClassDef(AliTRDtrack,2) // TRD reconstructed tracks